Light source device and projector

Abstract

A light source device includes: a light emitting tube; a reflecting mirror; and a tubular member disposed on a forward side of light emission of the reflecting mirror, and surrounding the light emitting tube, the tubular member has a pair of air circulating units communicating inside and outside of the tubular member and adapted to allow introduction of external air from the forward side toward a backward side of the light emission in a vertically symmetrical manner on a center axis of the light emitting tube, inside the air circulating unit there is disposed a air flow guide member, and the air flow guide member is pivoted rotatably around a predetermined rotational axis with respect to the air circulating unit under own weight of the air flow guide member, and rotates to thereby open and block at least a part of a flow passage inside the air circulating unit.

What is claimed is: 
     
       1. A light source device comprising:
 a light emitting tube having a light emitting section having a pair of electrodes disposed inside the light emitting section; 
 a reflecting mirror adapted to reflect a luminous flux emitted from the light emitting section; and 
 a tubular member disposed on a forward side of light emission of the reflecting mirror, and surrounding the light emitting tube, 
 wherein the tubular member has a pair of air circulating units communicating inside and outside of the tubular member and adapted to allow introduction of external air from the forward side toward a backward side of the light emission in a vertically symmetrical manner on a center axis of the light emitting tube, 
 inside the air circulating unit there is disposed an air flow guide member adapted to straighten the air introduced in the tubular member and make the air flow to the light emitting tube, and 
 the air flow guide member is pivoted rotatably around a predetermined rotational axis with respect to the air circulating unit under own weight of the air flow guide member, and rotates to thereby open and block at least a part of a flow passage inside the air circulating unit. 
 
     
     
       2. The light source device according to  claim 1 , wherein
 the rotational axis is tilted with respect to the vertical axis so that a side distant from the center axis is located on the backward side of the light emission in view from a direction perpendicular to a vertical axis and the center axis. 
 
     
     
       3. The light source device according to  claim 2 , wherein
 the air flow guide member has a central area shielding section and an end area shielding section connected to each other so as to form a predetermined angle with each other, 
 inside the air circulating unit, the air flow guide member is disposed at each of two positions located on a left side and a right side, respectively, side by side so that the respective end area shielding sections are separated from each other, and 
 the two air flow guide members, when the flow passage of the air flowing inside the air circulating unit is divided into three areas of a central area located in a center of the flow passage and end areas located respectively on the left and right of the central area, to one of a first rotational position where the central area is opened and the end areas are blocked with the end area shielding section, or a second rotational position where the end areas are opened and the central area is blocked with the central area shielding section. 
 
     
     
       4. The light source device according to  claim 3 , wherein
 the central area shielding section is formed to be longer than a distance between the two air flow guide members, and the central area shielding section of one of the two air flow guide members touches the central area shielding section of the other of the two air flow guide members when the one of the two air flow guide members rotates to the second rotational position. 
 
     
     
       5. The light source device according to  claim 4 , wherein
 the central area shielding section and the end area shielding section are connected to each other so as to form an acute angle, and 
 the end area shielding section is positioned so as to be parallel to the flow passage of the air flowing inside the air circulating unit when the air flow guide member is positioned at the second rotational position. 
 
     
     
       6. The light source device according to  claim 2 , wherein
 the tubular member has a discharge port adapted to discharge internal air to outside. 
 
     
     
       7. A projector comprising:
 the light source device according to  claim 1 ; 
 a light modulation device adapted to modulate a luminous flux emitted from the light source device in accordance with image information; and 
 a projection optical device adapted to project the luminous flux modulated in the light modulation device, 
 wherein the pair of light source devices is disposed so that the center axes are substantially aligned with and opposed to each other, and substantially perpendicular to a projection direction of the luminous flux from the projection optical device. 
 
     
     
       8. The projector according to  claim 7 , wherein
 the rotational axis is tilted with respect to the vertical axis so that a side distant from the center axis is located on the backward side of the light emission in view from a direction perpendicular to a vertical axis and the center axis. 
 
     
     
       9. The projector according to  claim 8 , wherein
 the air flow guide member has a central area shielding section and an end area shielding section connected to each other so as to form a predetermined angle with each other, 
 inside the air circulating unit, the air flow guide member is disposed at each of two positions located on a left side and a right side, respectively, side by side so that the respective end area shielding sections are separated from each other, and 
 the two air flow guide members, when the flow passage of the air flowing inside the air circulating unit is divided into three areas of a central area located in a center of the flow passage and end areas located respectively on the left and right of the central area, to one of a first rotational position where the central area is opened and the end areas are blocked with the end area shielding section, or a second rotational position where the end areas are opened and the central area is blocked with the central area shielding section. 
 
     
     
       10. The projector according to  claim 9 , wherein:
 the central area shielding section is formed to be longer than a distance between the two air flow guide members, and the central area shielding section of one of the two air flow guide members touches the central area shielding section of the other of the two air flow guide members when the one of the two air flow guide members rotates to the second rotational position. 
 
     
     
       11. The projector according to  claim 10 , wherein:
 the central area shielding section and the end area shielding section are connected to each other so as to form an acute angle, and 
 the end area shielding section is positioned so as to be parallel to the flow passage of the air flowing inside the air circulating unit when the air flow guide member is positioned at the second rotational position. 
 
     
     
       12. The projector according to  claim 8 , wherein:
 the tubular member has a discharge port adapted to discharge internal air to outside.